The great Art Spiegelman, who won a Pulitzer Prize in 1992 for “Maus,” his ground-breaking graphic novel about a survivor’s memories of the Holocaust, spoke about comic art and the influence of Jews in the genre to an enthusiastic crowd at Harvard’s Sanders Theatre. The talk, titled “Comix, Jews ’n Art: Dun’t Esk!!,” was sponsored by the Harvard Center for Jewish Studies and the Jewish Arts Collaborative. Spiegelman spoke about comic book pioneers like Milt Gross, “Batman” creator Bob Kane, “Superman” co-creator Joe Shuster, and William Gaines’s staff of Jewish writers at “Mad” magazine. “They couldn’t get jobs working for the mostly gentile-run magazines in New York, so they created comic books — and great art in the process,” said Spiegelman.